稽核帳戶中的 Amazon S3 儲存貯體政策

在 AWS Control Tower 中，只有當請求來自您的組織或組織單位 (OU) 時， AWS 服務才能存取您的資源。必須符合任何寫入權限的aws:SourceOrgID條件。

您可以使用aws:SourceOrgID條件金鑰，並在 Amazon S3 儲存貯體政策的條件元素中將值設定為組織 ID。這種情況可確保 CloudTrail 只能代表組織內的帳戶將日誌寫入 S3 儲存貯體；它可防止組織外部的 CloudTrail 日誌寫入 AWS Control Tower S3 儲存貯體。

此原則不會影響現有工作負載的功能。該策略顯示在以下範例中。

S3AuditBucketPolicy:
    Type: AWS::S3::BucketPolicy
    Properties:
      Bucket: !Ref S3AuditBucket
      PolicyDocument:
        Version: 2012-10-17
        Statement:
          - Sid: AllowSSLRequestsOnly
            Effect: Deny
            Principal: '*'
            Action: s3:*
            Resource:
             - !Sub "arn:${AWS::Partition}:s3:::${S3AuditBucket}"
             - !Sub "arn:${AWS::Partition}:s3:::${S3AuditBucket}/*"
            Condition:
              Bool:
                aws:SecureTransport: false
          - Sid: AWSBucketPermissionsCheck
            Effect: Allow
            Principal:
              Service:
                - cloudtrail.amazonaws.com
                - config.amazonaws.com
            Action: s3:GetBucketAcl
            Resource:
              - !Sub "arn:${AWS::Partition}:s3:::${S3AuditBucket}"
          - Sid: AWSConfigBucketExistenceCheck
            Effect: Allow
            Principal:
              Service:
                - cloudtrail.amazonaws.com
                - config.amazonaws.com
            Action: s3:ListBucket
            Resource:
              - !Sub "arn:${AWS::Partition}:s3:::${S3AuditBucket}"
          - Sid: AWSBucketDeliveryForConfig
            Effect: Allow
            Principal:
              Service:
                - config.amazonaws.com
            Action: s3:PutObject
            Resource:
              - Fn::Join:
                  - ""
                  -
                    - !Sub "arn:${AWS::Partition}:s3:::"
                    - !Ref "S3AuditBucket"
                    - !Sub "/${AWSLogsS3KeyPrefix}/AWSLogs/*/*"
            Condition:
              StringEquals:
                aws:SourceOrgID: !Ref OrganizationId
          - Sid: AWSBucketDeliveryForOrganizationTrail
            Effect: Allow
            Principal:
              Service:
                - cloudtrail.amazonaws.com
            Action: s3:PutObject
            Resource: !If [IsAccountLevelBucketPermissionRequiredForCloudTrail,
                [!Sub "arn:${AWS::Partition}:s3:::${S3AuditBucket}/${AWSLogsS3KeyPrefix}/AWSLogs/${Namespace}/*", !Sub "arn:${AWS::Partition}:s3:::${S3AuditBucket}/${AWSLogsS3KeyPrefix}/AWSLogs/${OrganizationId}/*"],
                !Sub "arn:${AWS::Partition}:s3:::${S3AuditBucket}/${AWSLogsS3KeyPrefix}/AWSLogs/*/*"]
            Condition:
              StringEquals:
            aws:SourceOrgID: !Ref OrganizationId

如需有關此條件金鑰的詳細資訊，請參閱 IAM 文件和標題為「針對存取資源的 AWS 服務使用可擴展控制項」的 IAM 部落格文章。